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by 286c8cb04bda 4642 days ago

  $ uname -s
  Darwin
  $ type seq
  seq is /usr/bin/seq
The man page says --

The seq command first appeared in Plan 9 from Bell Labs. A seq command appeared in NetBSD 3.0, and ported to FreeBSD 9.0. This command was based on the command of the same name in Plan 9 from Bell Labs and the GNU core utilities. The GNU seq command first appeared in the 1.13 shell utilities release.